CN113201670B - Anti-softening aluminum alloy material, anti-softening aluminum alloy wire and preparation method thereof - Google Patents
Anti-softening aluminum alloy material, anti-softening aluminum alloy wire and preparation method thereof Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
- C22C21/08—Alloys based on aluminium with magnesium as the next major constituent with silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/043—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with silicon as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/047—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with magnesium as the next major constituent
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- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
- H01B1/023—Alloys based on aluminium
Abstract
An anti-softening aluminum alloy material, an anti-softening aluminum alloy wire and a preparation method thereof relate to the field of aluminum alloy. The softening-resistant aluminum alloy material comprises the following components in percentage by mass: 0.2 to 0.6 percent of Si, 0.3 to 0.8 percent of Mg, 0.12 to 0.3 percent of Fe, 0.04 to 0.15 percent of M, 0.01 to 0.06 percent of Y, the total content of Mn, V, Ti and Cr is controlled to be less than or equal to 0.01 percent, and the balance is Al, wherein the mass ratio of Fe to Si is 0.2 to 0.8, and M consists of La and Ce. Based on the specific components and the proportion, the softening-resistant aluminum alloy material has better heat resistance and softening resistance, so the softening-resistant aluminum alloy material is particularly suitable for manufacturing a lead, the manufacturing cost cannot be obviously increased, and meanwhile, the softening-resistant aluminum alloy material has certain short-time high-load transmission capacity.
Description
Technical Field
The application relates to the field of aluminum alloy, in particular to an anti-softening aluminum alloy material, an anti-softening aluminum alloy wire and a preparation method thereof.
Background
Due to the fact that the power consumption demand is increased rapidly and the power grid load is increased rapidly due to the temperature change in winter and summer due to the cooling or heating demand, the peak value of the power consumption load exceeds the conventional design load, and the safe and stable operation of the power transmission line is challenged to a certain degree.
It is known that the actual operation temperature of a line is higher than the designed operation temperature due to overload of a power transmission line, so that line materials are softened after overload operation is carried out for a certain time, and the safety of the line is endangered.
In view of the above, the present application is hereby presented.
Disclosure of Invention
The application provides an anti-softening aluminum alloy material, an anti-softening aluminum alloy wire and a preparation method thereof, which can solve at least one technical problem.
The embodiment of the application is realized as follows:
in a first aspect, the present application provides a softening-resistant aluminum alloy material, which comprises the following components by mass percent:
0.2 to 0.6 percent of Si, 0.3 to 0.8 percent of Mg, 0.12 to 0.3 percent of Fe, 0.04 to 0.15 percent of M, 0.01 to 0.06 percent of Y, the total content of Mn, V, Ti and Cr is controlled to be less than or equal to 0.01 percent, and the balance is Al.
Wherein the mass ratio of Fe to Si is 0.2-0.8, and M is composed of La and Ce.
In the implementation process, the finally obtained softening-resistant aluminum alloy material has Al-Fe-Si phases distributed in an alpha-Al matrix along grain boundaries and in the crystal and Al- (M, Y) phases dispersed in the alpha-Al matrix through specific contents of elements M (La and Ce), Y and Fe, so that the heat resistance of the softening-resistant aluminum alloy material is improved, and meanwhile, the softening-resistant aluminum alloy material has better softening resistance under overload operation for a certain time and the operation safety of a circuit is improved, so that the softening-resistant aluminum alloy material is particularly suitable for manufacturing a lead.
Compared with Al-Zr series heat-resistant aluminum alloy wires, the Al-Zr series heat-resistant aluminum alloy wires do not need to be added with Zr and other elements on the basis of common aluminum-magnesium-silicon alloy wires, only the M, Y content and the Fe content are properly increased, the silicon-iron ratio is limited, and the like, so that the cost is effectively reduced and over-design is prevented compared with Al-Zr series heat-resistant aluminum alloy wires. The anti-softening aluminum alloy material can inhibit the aluminum alloy from climbing in a dislocation way under a high-temperature condition through the Al-Fe-Si phase, retard recrystallization and improve the anti-softening performance of the anti-softening aluminum alloy material; the compound addition of M and Y can not only form good grain refining effect, but also optimize the alloy conductivity, and Al- (M, Y) distributed in the grain boundary can be pinned in the grain boundary, so as to inhibit the grain boundary expansion, resist the grain growth under the heat effect, reduce the strength, and enable the softening resistant aluminum alloy material to form more efficient heat resistance. The Al-Fe-Si phase is matched with the Al- (M, Y) to ensure that the softening-resistant aluminum alloy material has better heat resistance to resist softening when being used for preparing a lead under short-time overload, and further can bear the short-time high-load power transmission requirement.
In a second aspect, the present application provides a method for preparing a softening-resistant aluminum alloy wire, comprising the following steps:
after aluminum liquid is obtained according to the formula of the anti-softening aluminum alloy wire, an iron source, a magnesium source, a silicon source, a lanthanum source, a cerium source and an yttrium source are added into the aluminum liquid, and the aluminum alloy melt is obtained by smelting.
And purifying the aluminum alloy melt, continuously casting, continuously rolling and drawing to obtain the aluminum alloy monofilament.
And carrying out first-stage heat treatment on the aluminum alloy monofilament, and stranding to form the anti-softening aluminum alloy conductor.
Wherein the formula comprises the following components in percentage by mass:
0.2 to 0.6 percent of Si, 0.3 to 0.8 percent of Mg, 0.12 to 0.3 percent of Fe, 0.04 to 0.15 percent of M, 0.01 to 0.06 percent of Y, the total content of Mn, V, Ti and Cr is controlled to be less than or equal to 0.01 percent, and the balance is Al.
Wherein the mass ratio of Fe to Si is 0.2-0.8, and M is composed of La and Ce.
In the implementation process, the preparation method of the softening-resistant aluminum alloy wire is simple in production control and convenient to operate, can ensure that the mechanical and electrical properties of the obtained softening-resistant aluminum alloy wire meet and are superior to those of national standards GB/T23308-.
In a third aspect, the present application provides a softening-resistant aluminum alloy wire obtained by the preparation method provided in the second aspect of the present application.
In the process of realizing, the anti-softening aluminum alloy conductor obtained by the application can be ensured to run safely and stably under the short-time high-load power transmission condition compared with a common aluminum-magnesium-silicon alloy conductor on the premise of not obviously increasing the manufacturing cost, the problem that the circuit safety is endangered due to softening of circuit materials caused by overload is prevented, the cost is effectively reduced compared with an Al-Zr series heat-resistant aluminum alloy conductor, and the problem of over-design caused by the fact that the Al-Zr series heat-resistant aluminum alloy conductor is used for a short-time high-load circuit is avoided.
Detailed Description
Embodiments of the present application will be described in detail below with reference to examples, but those skilled in the art will appreciate that the following examples are only illustrative of the present application and should not be construed as limiting the scope of the present application. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The conventional operating temperature of common aluminum alloy wire wires applied in domestic and domestic engineering is 80 ℃ or 90 ℃, and the national standards GB/T23308-2009 and European standard BS EN 50183 stipulate that different types of aluminum alloy wires need to meet the mechanical and electrical performance requirements such as strength resistivity and the like, but do not meet the requirement of heat resistance.
Therefore, the overhead conductor material which has good economy, can bear certain short-time high-load transmission capacity and has mechanical and electrical performance requirements meeting the requirements of related national standards GB/T23308-.
The following specifically describes the softening-resistant aluminum alloy material, the softening-resistant aluminum alloy wire, and the preparation method thereof according to the embodiment of the present application:
firstly, the application provides an anti-softening aluminum alloy material, and the aluminum alloy material here can be processed into rod material, aluminum alloy wire drawing wire (not stranded monofilament) or stranded aluminum alloy wire after treatment etc. according to the actual demand, can also be processed into aluminum alloy plate material etc. according to the demand, and does not limit here.
Specifically, the softening-resistant aluminum alloy material comprises the following components in percentage by mass:
0.2 to 0.6 percent of Si, 0.3 to 0.8 percent of Mg, 0.12 to 0.3 percent of Fe, 0.04 to 0.15 percent of M, 0.01 to 0.06 percent of Y, the total content of Mn, V, Ti and Cr is controlled to be less than or equal to 0.01 percent, and the balance is Al.
The mass ratio of Fe to Si is 0.2 to 0.8, and specifically, the mass ratio of Fe to Si is 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, or 0.8.
M consists of La and Ce.
Specifically, M is composed of, by mass%, 25% to 45% of La, and 55% to 75% of Ce.
Based on the specific components and proportions, the tissue composition of the anti-softening aluminum alloy material comprises an alpha-Al matrix, an Al-Fe-Si phase distributed in a grain boundary and a grain inside of the alpha-Al matrix, and an Al- (M, Y) phase dispersed and distributed in the alpha-Al matrix. The Al-Fe-Si phase can inhibit the climbing of aluminum alloy dislocation, retard the occurrence of recrystallization, improve the high-temperature softening resistance of the aluminum alloy material, form more efficient heat resistance on an aluminum alloy matrix, pin the aluminum alloy matrix at a crystal boundary, refine the crystal grains, prevent the expansion of the crystal boundary and improve the high-temperature softening resistance of the aluminum alloy.
That is, based on the above specific components and proportions, the anti-softening aluminum alloy material has better heat resistance to resist softening, so that the anti-softening aluminum alloy material is particularly suitable for manufacturing a lead and has the capability of bearing certain short-time high-load transmission.
Secondly, the application provides a preparation method of the softening-resistant aluminum alloy conductor, which comprises the following steps:
s1, according to the formula of the anti-softening aluminum alloy wire, after aluminum liquid is obtained, a silicon source, a magnesium source, an iron source, a lanthanum source, a cerium source and an yttrium source are added into the aluminum liquid, and the aluminum liquid is smelted to obtain an aluminum alloy melt.
Wherein the temperature of the aluminum liquid is 720-750 ℃.
The mode of obtaining the aluminum liquid can be that firstly an aluminum ingot is obtained, then the aluminum ingot is melted, and in order to avoid introducing impurities, the aluminum ingot with the purity not less than 99.7 percent can be adopted. Besides, the mode of obtaining the aluminum liquid can be directly adopting electrolytic aluminum liquid.
Specifically, the formula comprises the following components in percentage by mass:
0.2 to 0.6 percent of Si, 0.3 to 0.8 percent of Mg, 0.12 to 0.3 percent of Fe, 0.04 to 0.15 percent of M, 0.01 to 0.06 percent of Y, the total content of Mn, V, Ti and Cr is controlled to be less than or equal to 0.01 percent, and the balance is Al.
Wherein the mass ratio of Fe to Si is 0.2-0.8, and M is composed of La and Ce. Mn, V, Ti and Cr are inevitable impurities.
Specifically, M is composed of, by mass%, 25% to 45% of La, and 55% to 75% of Ce.
S2, purifying the aluminum alloy melt, continuously casting, continuously rolling and drawing to obtain the aluminum alloy monofilament.
Optionally, the aluminum alloy melt obtained after purification has a hydrogen content of less than or equal to 0.15ml/100 gAL. Through the limitation, the formation of air holes and the like during the solidification of the subsequent cast ingot is effectively avoided, the problems of easy breakage and the like caused by hydrogen are avoided, the tensile strength is improved, and the specific tissue form during the cast state is adjusted.
Optionally, the step of purifying comprises: refining, keeping the temperature and standing for a preset time, stirring, performing online degassing, and filtering by a filtering device.
Wherein, the refining can be carried out by adopting an adsorption purification mode or a non-adsorption purification mode, and the refining is not limited herein. The sediment can be carried out through the preset time of stewing after the refining, stirs behind the sediment simultaneously, makes gaseous fully spill over, carries out online degasification this moment and can guarantee the degassing effect, avoids further introducing impurity simultaneously, filters through filter equipment at last, further gets rid of the non-metallic impurity in the aluminum alloy melt, reaches the purpose of purifying the aluminum alloy melt, and above-mentioned purification operation process can refer to the correlation technique, does not specifically prescribe a limit herein.
The online degassing is carried out by adopting an online degassing device, wherein a reaction chamber of the online degassing device is provided with one or more rotating nozzles, the rotating nozzles can rotate in one direction or select in two directions, and can be made of graphite or other materials, so long as the purpose of online degassing can be achieved.
It should be noted that the contents of the components in the purified aluminum alloy melt should be the same as the target contents in the formulation or within the tolerance range allowed by the formulation. Therefore, optionally, sampling is carried out after the refining step and before the online degassing step, the actual content of the components of the aluminum alloy melt is measured and compared with the target content, if the content of any component is different from the content in the formula or exceeds the error range allowed by the formula, the melting step is returned and adjusted until the content of each component is qualified, and the next step is carried out.
In the step of continuous casting and rolling, the temperature of the aluminum alloy melt entering the crystallizing wheel of the casting machine is 690-720 ℃.
Optionally, in the step of continuous casting and rolling, the rolling temperature is 490-520 ℃.
And obtaining an aluminum alloy rod material by the continuous casting and rolling, and then drawing the aluminum alloy rod material to obtain the aluminum alloy monofilament. Wherein the drawing step may be performed by drawing the aluminum alloy rod of the processed target diameter using a double-headed drawing machine such as an 11-die to obtain an aluminum alloy monofilament.
And S3, carrying out first-stage heat treatment on the aluminum alloy monofilament, and stranding to form the anti-softening aluminum alloy conductor.
Optionally, in some embodiments provided herein, the first stage heat treatment comprises: the treatment at 140-160 deg.C for 6-9 h, specifically at 140 deg.C, 145 deg.C, 150 deg.C, 155 deg.C, 157 deg.C or 160 deg.C for 6h, 6.5h, 7h, 7.5h, 8h, 8.5h or 9h, etc., can strengthen the precipitation of Al- (M, Y) phase, reduce the distortion of aluminum alloy crystal interior, and improve the mechanical and electrical properties of the obtained aluminum alloy wire.
Optionally, the preparation method further comprises a second-stage heat treatment of the stranded aluminum alloy monofilament after the step of stranding to obtain the softening-resistant aluminum alloy conductor, wherein the second-stage heat treatment comprises: treating at 90-120 deg.c for 5-8 hr. Specifically, for example, the stranded monofilament is treated for 5 hours, 5.5 hours, 6 hours, 6.5 hours, 7 hours, 7.5 hours or 8 hours at the temperature of 90 ℃, 95 ℃, 100 ℃, 105 ℃, 110 ℃, 115 ℃ or 120 ℃ and the like, so that the grain diameter and distribution of the Al-Mg-Si phase are further homogenized, and the mechanical and electrical properties of the final aluminum alloy lead are further improved.
Finally, the application provides a softening-resistant aluminum alloy conductor which is prepared by the preparation method of the softening-resistant aluminum alloy conductor.
Since softening mainly means that the aluminum alloy conductor is softened due to high temperature under high temperature conditions, the strength loss rate of the stranded aluminum alloy monofilament after long-term treatment under high temperature conditions is used as an anti-softening evaluation index in the application.
Specifically, the strength loss rate of the stranded aluminum alloy monofilament is less than 5 percent after the stranded aluminum alloy monofilament is heated at 125 ℃ for 100 hours.
The softening-resistant aluminum alloy material, the softening-resistant aluminum alloy wire and the preparation method thereof according to the present application are further described in detail with reference to the following examples.
Examples 1 to 8
Examples 1 to 8 respectively provide a softening-resistant aluminum alloy wire, which is produced by the following production methods:
(1) the raw materials were prepared according to the formulations corresponding to examples 1-8 in table 1: an intermediate alloy as a silicon source, a magnesium source, an iron source, a lanthanum source, a cerium source and an yttrium source, and an aluminum ingot with a purity of 99.7%.
(2) Smelting an aluminum ingot with the purity of 99.7% in a heat preservation furnace, and then accurately adding the rest raw materials for smelting.
(3) And deslagging and degassing by adopting a powder spraying refining agent in the heat preservation furnace, purifying in the furnace, sampling the aluminum alloy liquid in the heat preservation furnace, and standing the aluminum alloy liquid in the heat preservation furnace for 30min after ensuring that the content of each element meets the mixture ratio in the table 1. Then electromagnetic stirring is carried out on the aluminum alloy liquid in the heat preservation furnace, degassing is carried out again, and the hydrogen content is measured on line and is less than or equal to 0.15ml/100 gAL. Then filtering by adopting a 30-mesh foamed ceramic filter plate in a launder to remove non-metallic impurities.
(4) And (3) feeding the aluminum alloy liquid prepared in the step (3) into a continuous casting and rolling production line, allowing the aluminum alloy liquid to flow to a ladle gate through a runner for automatic casting, controlling the temperature of a lower ladle at 700 ℃ (namely the temperature when the aluminum alloy liquid enters a casting machine) to obtain a cast ingot, and then feeding the cast ingot into a continuous rolling machine for rolling when the temperature of the cast ingot is reduced to about 520 ℃ to obtain a rod material.
(5) And (3) drawing the rod obtained in the step (4) by using a double-head wire drawing machine with 11 dies to form monofilaments with various specifications shown in table 3, then carrying out a first-stage heat treatment process shown in table 2 on the monofilaments obtained in the examples 1-6 in a box type aging furnace, and carrying out a second-stage heat treatment process shown in table 2 after stranding to form the aluminum alloy wire.
Wherein, the total content of Mn, V, Ti and Cr is indicated by four small elements in Table 1.
TABLE 1 specific formulations for examples 1-8
Table 2 heat treatment process of examples 1-8
The rod materials obtained in the examples 1 to 8 and the aluminum alloy monofilaments (referred to as twisted monofilaments for short) subjected to the second-stage heat treatment after twisting are subjected to resistivity and tensile strength tests according to GB/T23308-2009, and the softening resistance of the twisted monofilaments is characterized by the strength loss rate of heating at 125 ℃ for 100 hours.
The results are shown in table 3:
TABLE 3 measurement results
According to table 3, it can be seen that strength loss rates of the twisted monofilaments prepared in examples 1 to 8 are less than 5% after being heated at 125 ℃ for 100 hours, so that the anti-softening aluminum alloy conductor can be ensured to run safely and stably under short-time high-load power transmission conditions, and the problem that the circuit material is softened due to overload and the circuit safety is endangered is prevented. And the electrical resistivity and tensile strength of the stranded monofilaments meet and are superior to the performances required by national standards GB/T23308-Bush 2009 and European standard BS EN 50183.
The difference between the embodiment 8 and the embodiment 1 is that the second-stage heat treatment is not performed, and it can be seen that the strength loss rate of the stranded monofilaments prepared by the method after being heated at 125 ℃ for 100 hours is less than 5%, and the stranded monofilaments still meet and are better than the performances required by the national standards GB/T23308-2009 and the European standard BS EN 50183.
Comparative examples 1 to 10
Comparative examples 1 to 10 each provide a softening-resistant aluminum alloy wire, and comparative examples 1 to 10 are similar to example 1 in the overall manufacturing method except for the specific formulation shown in table 4 and the heat treatment process shown in table 5. Wherein, in Table 4, four small elements are used to indicate the total content of Mn, V, Ti and Cr.
TABLE 4 specific formulations of comparative examples 1-10
TABLE 5 Heat treatment Process for comparative examples 1-10
The rod materials obtained in the comparative examples 1-10 and the aluminum alloy monofilaments (referred to as twisted monofilaments for short) subjected to the second-stage heat treatment after twisting are subjected to resistivity and tensile strength tests according to GB/T23308-2009, and the high-temperature softening resistance of the twisted monofilaments is represented by the strength loss rate of heating the twisted monofilaments at 125 ℃ for 100 hours.
The results are shown in Table 6:
TABLE 6 measurement results
Among them, according to tables 4 and 5, comparative examples 1-2 are different from the softening-resistant aluminum alloys of the present application mainly in that their iron contents are lower than the minimum content of the present application, resulting in strength loss rate of > 6% of the stranded monofilaments obtained in comparative examples 1-2 heated at 125 ℃ for 100 hours, based on insufficient iron content.
The main difference between the comparative example 3 and the softening-resistant aluminum alloy of the present application is that the iron content is higher than the highest content defined in the present application, and based on the excessive iron content, the strength loss rate of the stranded monofilament obtained in the comparative example 3 is more than 6% after being heated at 125 ℃ for 100h, and the resistivity of the stranded monofilament is obviously increased and exceeds the maximum resistivity required by the national standard GB/T23308-.
The comparative example 4 and the comparative example 5 are different from the application mainly in that the total addition amount of La and Ce is beyond the range of the application, the impurity content is beyond the range controlled by the application, the strength loss rate of the stranded monofilament is more than 5% after being heated for 100 hours at 125 ℃, and the resistivity is higher than that of the stranded monofilament.
The main difference between the comparative example 6 and the comparative example 7 and the softening-resistant aluminum alloy of the application lies in that the heat treatment process is different, and the tensile strength of the obtained stranded monofilaments does not meet the requirements of national standards GB/T23308-.
The main difference between comparative example 8 and comparative example 9 and the softening-resistant aluminum alloy of the present application is the iron-silicon content and the mass ratio, wherein the mass ratio of Fe to Si of comparative example 8 is less than the range defined in the present application, and the strength loss rate of the obtained stranded monofilament after heating at 125 ℃ for 100h is > 5%. The mass ratio of Fe to Si in comparative example 9 is larger than the range defined in the present application, and the resistivity thereof is 34.763n Ω. m, which is far beyond the requirements of GB/T23308-.
Comparative example 10 differs from example 1 mainly in that the total addition of La and Ce is different from that in the present application, wherein the total addition of La and Ce in comparative example 10 is less than the lowest limit of the present application, and the strength loss of the resulting stranded monofilament after heating at 125 ℃ for 100h is > 5%.
In summary, the softening-resistant aluminum alloy material provided by the embodiment of the application is based on specific components and proportions, so that the softening-resistant aluminum alloy material has better heat resistance and softening resistance, and is particularly suitable for manufacturing wires. The preparation method of the anti-softening aluminum alloy wire is simple and controllable, the electrical performance and the mechanical performance of the obtained anti-softening aluminum alloy wire not only meet the requirements of national standards GB/T23308-.
The foregoing is merely exemplary of the present application and is not intended to limit the present application, which may be modified or varied by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (5)
1. The preparation method of the softening-resistant aluminum alloy wire is characterized by comprising the following steps of:
after aluminum liquid is obtained according to the formula of the anti-softening aluminum alloy wire, adding a silicon source, a magnesium source, an iron source, a lanthanum source, a cerium source and an yttrium source into the aluminum liquid, and smelting to obtain an aluminum alloy melt;
purifying the aluminum alloy melt, continuously casting, continuously rolling and drawing to obtain an aluminum alloy monofilament;
carrying out first-stage heat treatment on the aluminum alloy monofilament, and stranding to form an anti-softening aluminum alloy conductor;
the formula comprises the following components in percentage by mass:
0.2 to 0.6 percent of Si, 0.3 to 0.8 percent of Mg, 0.12 to 0.3 percent of Fe, 0.04 to 0.15 percent of M, 0.01 to 0.06 percent of Y, the total content of Mn, V, Ti and Cr is controlled to be less than or equal to 0.01 percent, and the balance is Al;
wherein the mass ratio of Fe to Si is 0.2-0.8, M is composed of, by mass percent, 25-45% of La and 55-75% of Ce, and the first-stage heat treatment comprises: processing for 6-9 h at 140-160 ℃;
wherein the strength loss rate of the stranded aluminum alloy monofilament heated at 125 ℃ for 100 hours is less than 5%.
2. The manufacturing method according to claim 1, further comprising performing a second-stage heat treatment after the step of stranding to obtain the softening-resistant aluminum alloy wire, wherein the second-stage heat treatment includes: treating at 90-120 deg.c for 5-8 hr.
3. The production method according to claim 1, wherein in the step of continuous casting and rolling, the temperature of the aluminum alloy melt at the time of entering the caster crystallization wheel is 690 ℃ to 720 ℃.
4. The production method according to claim 1, wherein in the step of continuous casting and rolling, the rolling temperature is 490 ℃ to 520 ℃.
5. A softening-resistant aluminum alloy wire produced by the production method according to any one of claims 1 to 4.
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| CN105441736A (en) * | 2015-11-17 | 2016-03-30 | 国网河南省电力公司周口供电公司 | Composite aluminum-alloy conductor special used for ultrahigh pressure |
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